Lying down with a dizzy head may be due to benign paroxysmal positional vertigo, may also be related to postural hypotension, cervical spondylosis and other factors. 1. Benign paroxysmal positional vertigo: also known as otolithiasis, generally due to the degeneration of otoliths, otoliths, such as the stability of the reduction of the cause, often in the head and neck position change, there is a transient, transient vertigo lasting for a few seconds, accompanied by nausea, vomiting, panic and other uncomfortable symptoms. 2. Postural hypotension: when the patient gets up from the lying position, due to the rapid change of blood circulation, it will cause a drop in blood pressure, and there will be dizziness, blackness and other uncomfortable symptoms, and then you can measure the blood pressure immediately to help diagnosis. 3. Cervical spondylosis: Especially vertebral artery cervical spondylosis, because the lesion compresses the carotid artery, resulting in a transient lack of blood supply to the brain, there will be dizziness, headache, dyskinesia and so on. Patients lying down with dizziness may also be caused by other reasons, it is recommended to go to the hospital in a timely manner to check, clear causes of dizziness, under the guidance of the doctor for targeted treatment.